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a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure ensure that:
•
Mechanical handling equipment is available, if required, for handling refrigerant cylinders;
•
All personal protective equipment is available and being used correctly;
•
The recovery process is supervised at all times by a competent person;
•
Recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
f) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer s instructions.
h) Do not overfill cylinders. (No more than 80% volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from
site promptly and all isolation valves on the equipment are closed off.
k) Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.
18) Labeling
Equipment shall be labeled stating that it has been de-commissioned and emptied of refrigerant. The label shall be dated and signed. Ensure that
there are labels on the equipment stating the equipment contains flammable refrigerant.
19) Recovery
When removing refrigerant from a system, either for service or decommissioning, it is recommended good practice that all refrigerants are
removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct
numbers of cylinders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and
labeled for that refrigerant(i.e special cylinders for the recovery of refrigerant). Cylinders shall be completed with pressure relief valve and
associated shut-off valves in good working order.
Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs. The recovery equipment shall be in good working order
with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of flammable refrigerants. In addition, a
set of calibrated weighing scales shall be available and in good working order.
Hoses shall be completed with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in
satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the
event of a refrigerant release. Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant Waste
Transfer note arranged. Do not mix refrigerants in recovery units and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that
flammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the
suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall
be carried out safely.
20) Transportation, marking and storage for units.
Transport of equipment containing flammable refrigerants Compliance with the transport regulations.
Marking of equipment using signs Compliance with local regulations.
Disposal of equipment using flammable refrigerants Compliance with national regulations.
Storage of equipment/appliances.
The storage of equipment should be in accordance with the manufacturer’s instructions.
Storage of packed (unsold) equipment.
Storage package protection should be constructed such that mechanical damage to the equipment inside the package will not cause a leak of the
refrigerant charge.
The maximum number of pieces of equipment permitted to be stored together will be determined by local regulations.
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